Hydraulic center-shifting mechanism



Aug. 2s, 1928. 1,681,969

V. ANGERER xiYDRAuLIc CENTER SHIFTING uEcHAN1suj '99m/1F25 Aug. y28,1928.

1,681,969 Vv. ANGERER ,f YQRAULIC CENTER SHIFTING MECHANISM Firleaneo.15. 1919 2 sheets-sheet 2 A TT ORNE Y ting vthe control of the hydraulicadjustin elements, wherein such Patented Aug. 28, 1928.

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masonic CENTER-saumure nncmms'm.

Applicationled December 15, 1919. Serial -844,959.

i `'This invention relates to hydraulic adjusting means for eccentricsand like power elements may be set for any power variation, from zero tomaximum, and .maintained in such set position automatically.`

The invention means for setprovides a means for a predetermined movementof the powerelements,l vtheir movementacting to mechanically govern theHuid-pressure control to limit the movement of the power elements to thepredetermined positions. This mechanical control of the fluid pressureis responsive to any movement ofthe power elements, and hence afords` anautomatic compensation for leakage losses in the adjusting fluid.

v as the direct and .hydraulic adjustlng line to .an eccentric-'operatedThe invention contemplates the application of the fluid pressuredirectly to the powerelement to be adjusted, and referably to theinterior of such element, o thereby cause the pressure fluid to act atall times sole means for maintainpower element in its adjusted posi-P'ing the tion. T 1s insures a simple and direct adjustment, the poweryresistance of which is practically eliicient and immediately responsiveto control adjustments. l

In the drawings j l .c Fig. 1 is a longitudinal sectional view, partlyin elevation, showing the improved means applied to a pump operatedthrough balanced shiftable eccentrics. l f

Fig. 2'is `a section on line 2-2 of Fig. 1. Fig. '3 is asection on line,3-3 vof Fig. 2. Fig. 4 is a section on line 4 4 of Fi .1. l Fig. 5 is asection on line 5-5 of Fig'. 2, vthe eccentric being shown in elevation.

6-6. of Fig. 1. Y Fig. 7 is a section online 7 -7 of Fig; 1.

ig.- 8 is .a section on line 8-8 of Fig. 1. Fig. 9 'is a"section on line2)*9 of Fig. 1.

Fig.` 10 is a section view of the pilot .v alve,

indicated by dotted line connections bet een said Fig. 10 andFigs.5,'f7, 8, and 9.l

The invention is here shown ,as 'applied pump, and while n the detailsof the following description will be limited to such application; it isappare.y

Aon opposite sides of 1g. 6 is a section partly in elevation on areclosed by the sh uid movement 1 as controlled by such i ,ferredto entthat the invention is equally applicable to the control of other. powerelementsV designed for powervariation through their ad- Justment.

shaft 11, mounted in bearings 12, supported ina hollow base or body 13,to which body g y is secured the pump casing 4. The plungers v15operating in the pum such power elements 1n` actuated by ring members 16caring upon and operated by eccentrics 17.

The shaft 11 is formed intermediate the eccentrics 17 with a rectangularenlargement or collar 18, and the eccentrics are arran ed thisenlargement.- e-I yond the eccentrics 17, relative to the enlargement,there is keyed or otherwise secured on .the shaft 11 eccentric plates19, cach having a wall nextthe eccentric corresponding in dimensions tothe maximum dimension' of the enlargement 18. The plates 19 are formedto provide eccentrics 20,having ring members 21 for actuating valvemembers 22. End plates 23 are shown as threaded upon the shaft 11,immediately beyond the plates 19, to thereby maintain the assembly,while permitting the ready separation of the parts when necessary.

The eccentrics are mounted for movement on shaft 11, through interioropenings 24, hereinafter termed fluid chambers, which in dimensionsinone direction exceed that of the shaft, to permit desired movement ofsuch-eccentrics. The eccentrics are maintained in sliding held againstother independent` movement relative thereto,.by providing the shaftwith o posed vflattened portions 25, and forming tlibe correspondingywalls of the eccentric chambers 24 for a fluid tight engagement withsuch flattened portions. the chambers 424 longitudinally of the shaftlby the walls of the plates 19. The' eccenvtries are thus formed with.fluid chambers which are closed except for communication with` the Huidducts vThe eccentrics are also provided #with consisting in thelprovision on each eccentric, at right angles tothe shaft .11 ofextensions 26.

on the 'respectiveeccentrics are "The pump illustrated includes a power.l

casing are relation to the shaft, but` The ends of` aft enlargement 18and tov be hereinafter rev e extensions disposed 1n -means for balancingthe' centrifugal force. 'thereof said means parallelism. to theflattened portions 25 of the shaft 11, the extensions of one eccentricprojecting toward the extensions of the other eccentric. rlhe extensionsbear upon those Walls of the shaft enlargement deiining the minordimension of such enlargement, and such extensions are further providedwith rounded outstanding housings 27, each having terminal inwardlyextending lips 28. The arrangement ofthe housings 27 of both eccentricsprovide for the reception, on opposite sides of the shaft, of a coilspring 29, held, as shown, in the adjacent housings of separateeccentrics and terminally engaged by the lips 28. The springs 29 areprefer'- ably positioned under slight initial compression, so that inany movement of the eccentrics the springs will be compressed andtensioned in proportion to such movement, to thereby olfset or balancethe centrifugal force. Inwardly of the housings, tive extensions 26 areformed with gear racks 30, the opposed-racks cooperating with pinions3l, on a shaft 32 rotatively mounted in and transversely to the shaftl1,the shaft 32 being control rod 34 is slidably arranged in a central bore35 ofthe shaft'll, and is provided with a gear rack 36 at all times inmesh with the pinion 33. The movement of the eccentrics will thereforebe transmitted to the .control shaft 34, which movement is utilized forthe automatic regulation to be later referred to.

The shaft 11 is formed with longitudinally extending fluid ducts orchannels 37 and 38, which channels communicate with the chambers 24 ofthe eccentrics, or more exactly with the respective divisions of eachchamber .-24 formed by the shaft 11. That is to say, channel 37 has anopen port 39 leading to one chamber division of one eccentric -and aport 40 leading tothe relatively op- 'posite chamber division of theother eccentric. The channel 38 has similar ports 4l and 42communicating with the remaining and respective chamber divisions of theeccentrics. Therefore, each fluid channel but with divisions thereof.This to be used as a fluid opposed chamber permits either channelpressurelchannel, vwhile the remaining channel serves as an exhaustchannel, the particular luid channel simultaneously delivering fluidunder pressure to both eccentrics, but

in opposite chamber divisions thereof, so that the eccentrics aresimultaneously moved in opposite directions with Athe same pressure.

The end ofthe shaft 11, opposite the power end thereof, is formed withports 43, 44, communicating with the respective channels 37 and 38, andopening through the surface of the shaft into hollow distributing rings45 and 46, -arrangedto encircle the shaft and fixed against rotation inany apthe respec-` centrally formed with a pinion A.-

propriate manner. Arranged above the distributors 45 and 46 is a pilotvalve including a casing 47, open at the ends to the interior of thebody 13, and having ports 48, .'49, in pipe communication, as at 50,with the respective distributors 45, 46. Valves 51, 52 in the pilotvalve casing, control the ports 48, 49, and are connected to a valve rod53, so as to similarly govern such ports, that is simultaneously open orclose them. The body 13 serves as a fluid reservoir for the hydraulicadjusting means, and the pressure of the fluid is secured through a pump54, `driven through gears 55 from the shaft ll, yand having its intake56 open to the fluid in the reservoir. The pump outlet 57 leads into thepilot valve casing between the portsy 48 and 49, said pump connectionhaving a spring loaded outlet 58, to by-pass the fluid from the pumpback into the reservoir when the pilot valve is in neutral or closedposition.

The pilot valve is through a hand lever 59, having its lower endrotatively fulcrumed on the end of rod 34, ,the pilot valve rod 53beingconnected toI the lever `59 at Gl intermediate the ends of the latter,by means ofthe link 60. The upper end ofthe lever 59 is provided with alatch G2 adapted to cooperate with a notched ,segment G3, whereby thelever may be moved to open the pilot valve to the predetermined degree,and temporarily locked in such adjustment by the latch (32. K

With the lever 59 moved a predetermined degree, for example toward theleft in Fig. l, and locked in such position, the fulcrum of the lever isthe point of the latch 62, and the y.pilot valves will be moved towardthe left. This movement of the valves opens the port 48 to the pump,while the port 49 is opened to the reservoir through the end of the'casing v47. lFluid channel 37 of shaft.

rod 34 is corresponr'lingly moved, through operation of the pinion shaft32, and as the rod 34 is moved longitudinally of the shaft 11, thefulcrum of lever 59 is of course correspondingly moved. As the handlever 59 is locked to the segment 63, such point now becomes the fulcrumof the lever 59, and the shifting of rod 34 loperates the lever 59 onthe new fulcrum to return the pilot Walves to a neutral or closedposition. This cuts off the pressure fluid to the eccentrics, and theyare held in their thenV adjusted positions. With a knowledge of thelever movement necessary to insure a predetermined adjustment of theeccentrics, it is aplll() lli parent that the-mere movement of the leverto such position will -result in an adjustment of the eccentrics and theautomaticallygoverned cut-oil or controlof fluid. v In the event ofleakage from the eccentric chambers, the resultant movement of theeccentrics will correspondingly shift the rod 34 to thereby open theVpilot valve in the proper direction and admit additional pressure fluidto restore the eccentrics to the preadjusted positions, thuscompensating'automatically for leakage. v The hydraulic center-shiftshown and described utilizes the power shaft as the means forgeneratingthe pressure of the operating fluid, through actuating thepressure pump, 'so that beyond setting the hand lever for the desiredadjustment, the control is entirely automatic.

Having thus .described the invention, what -is claimed as new, is z- 1.A shaft, eccentrics mounted thereon for adjustment, each eccentric fluidbeing formed l with acha-mber divided by the shaft, Huid channelsextending longitudinallyofthe shaft and communicating with alternatechamber divisions of the eccentrics, a pilot valve for controlling theadmission of iuid to the channels, means for manually operating thevalve,

land means movable lengthwise and within 'the shaft and responsive toymanual adjustment of the valve for automatically operating the valve inopposition to the manual operation following a predetermined -adjustmentof the eccentrics under the pressure Huid.

2. A shaft, eccentrics mounted thereon for adjustment, each eccentricbein fprmed with a chamber divided by the saft, fluid channels extendinglongitudinally of the' shaft and communicating with alternate chamberdivisions of the eccentrics, afpilot valve for controlling the admissionof Huid to the channels, a manually operated means for opening thevalve, and means movable lengthwise and within the shaft andY operatedby the movement of the eccentricsfor automatically closing the valve.

3. A shaft, eccentrics mounted thereon for adjustment and each formedwitha chamthe .pressure tending longitudinally of the shaft andcommunicating with the alternate chamberdivisions of the eccentrics, apilot valve controlling said channels, alever for operating said valve,a rod movable in a bore of the shaft, a connection between said rod andpilot valve, and means actuated by adjustlng movement of the eccentricsto loperate said rod.

5. A shaft, eccentrics mounted for adjustment thereon, each 'of saideccentrics being formed with a chamber divided by the shaft, andI meansfor deliver-ingv a pressure fluid simultaneously to r opposedchamber-divisions of the eccentrics, said. means including a pilotvalve, a lever for operating said valve, longitudinally by theadjustment of the eccentrics, said lever being mounted on said rod, andmeans to fix one end of the lever following the valve operation therebyto provide a fulcrum for the lever under rod operation. thereof.'

6; A shaft, eccentrics `having chambered 4openings mounted on tle shaftto divide suchchambers by the shaft, means on the shaft for closing thechambers beyond the shaft, housings on the eccentrics opening towardand` adjacent each other, and a spring mounted in the adjacent housingsof the respective eccentrics, said spring being tensioned in theopposite movement of the eccentrics( In testimony whereof I aiix mysignature.. v

VICTOR ANGERER.

a rod movable in the shaft and shifted

